Centrifugal fan



A. MATHIS. CENTRIFUGAL FAN. APPLICATION FILED AUG-7. 1919.

Patented Oct. 5, 1920.

Kim.-

2 SHEETS-SHEET I.

AI MATHIS.

CENTRIFUGAL FAN.

APPLICATION FILED AUG-7,1919.

1,354,673, Patented Oct. 5, 1920,

2 SHEETS-SHEET 2. 2166 B 15 6 \J UNITED STATES AUGUST MA'IHIS, OF

CHICAGO, ILLINOIS.

GENTRIFUGAL FAN.

Application filed August 7,

To all whom it may concern:

Be it known that I, AUGUST MATHIs, a citizen of the United States ofAmerica, and a resident of Chicago, in the county of Cook, State ofIllinois, have invented certain new and useful Improvements inCentrifugal Fans, of which the following is a specification.

This invention relates to the class of centrifugal air movers or blowershaving a blower wheel of the peripherally bladed type, and has for itsobject To provide a simple and efficient structural formation andassociation of parts in a blower wheel of the above mentioned type,adapted to afford a strong and substantial connection between thebladedrim portion and the hub portion of the wheel leaving a practicallyunobstructed central chamber for the incoming airand capable ofconvenient and effective adjustment to attain perfect concentricity ofthe wheel rim in relation to the axis of revolution, all as willhereinafter more fully appear. In the accompanying drawings:

Figure 1,- is a side elevation with parts broken away and in section ofa blower wheel embodying the preferred form of the present invention.

Fig. 2, is a transverse sectional elevation of the same.

Fig. 3, is an enlarged detail sectional elevation of the wheel hub andassociated parts.

Fig. 4 is an enlarged detail end elevation of the same.

Fig. 5, is an enlarged detail side elevation of an end portion of thewheel hub.

Fig. 6, is an elevation of one of the spokes of the blower wheel.

Like reference numerals indicate like parts in the several views.

As represented in the drawings the bladed rim member of the blower wheelis Specification of Letters Patent.

Patented Oct. 5, 1920.

1919. Serial No. 315,854.

tion or shell 6, the respective ends of which overhang the respectivewebs 5 and are formed with open ended slots 7 for the reception of theends of the hereinafter described structural metal spokes of the blowerwheel.

In the preferred form of the hub, the open ended slots 7 are arranged inpairs tangentially inclined in opposite directions and with one slot ofthe pair having a greater length than the other, so that the crossedspoke ends of the present structure may pass each other withoutinterference. Inner abutment faces 8 for the at taching nuts of thespokes are formed in right-angle relation to the slots 7 as shown moreparticularly in Fig. 4.

9 designates disks fitting the annular end portion 4 of the hubaforesaid, and adapted to close the end cavities of the hub formed bythe overhanging end portions of the rim or shell 6 and in which the attaching nuts of the wheel spokes are contained.

1O designates the series of spokes connecting the rim and hub members ofthe wheel together, and which in the present inven tion are of the Vform shown in Figs. 2 and 6, and formed of rod or like structural metal,with the apex of each spoke adapted to engage in a transverse orifice inthe central annular ring 1 aforesaid, and with the respective ends ofthe spoke screw-threaded to receive the attaching nuts 11 by which thespokes are tensioned and adjusted in a convenient and efficient mannerto properly center the hub member in relation to the bladed rim memberof the blower wheel.

Vith the present construction each V shaped spoke member constitutes twoindividual spokes of the blower wheel, with the longitudinal spread ofsaid spokes extending to opposite ends of the hub member to provide therequired transverse rigidity to the blower while in actual use.

In the preferred arrangement of the spokes 10 as shown in the drawings,the

,same will have the usual tangential and crossed relation, yet any otherusual and ordinary arrangement may be employed if found desirable inspecial uses of the blower wheel.

In all cases the respective forks of each V shape spoke 10 will be on acommon plane, so that in the tensioning operation of the nuts 11 anaccurate, rapid and effective tainment of the desired balance or center?ing of the wheel rim with relation to the axis of rotation is secured,without causing distortion or buckling of the rim portion of the wheel.Having thus fully described my said invention what I claim as new anddesire to secure by Letters Patent, is

1. In a blower Wheel, the combination of a rimimember formed by acentral ring of plate metal and a peripheral series of attached blowerblades, a hub member having substantially as set forth.

2. In a blower wheel, the combination of a rim member formed by a'central ring of plate metal and aperipheral series of attached blowerblades, a hub memberhaving overhanging end portions formed with openended receiving slots, a series of connecting spokes of a V form, theapex of which has engagement in orifices in the aforesaid ring and theinner ends of which spokes pass through the aforesaid slots, andadjusting nuts engaging said inner ends of the spokes and adapted totension and balance the fan parts, substantially as set forth.

3. I11 a blower wheel, the combination of a rim member formed by acentral ring of plate metal and a peripheral series of attached blowerblades, a hub member having overhanging. end portions formedwith openended receiving slots having different lengths and oppositely inclinedrelation, a

series of connecting spokes of a V form, the

apex of which has engagement in orifices said inner ends of the spokesand adapted to tension and balance the fanparts, substantially as setforth.

4. In a blower wheel, the combination of a rim member formed by acentral ring of plate metal and a peripheral series of attached blowerblades, a hub member having overhanging end portions formed withreceiving slots, a series of connecting spokes of a V form, the apex ofwhich has engagement in orifices in the aforesaid ring and the innerends of which spokes pass through the aforesaid slots, adjusting nutsengaging said inner ends of the spokes and, adapted to tension andbalance the fan parts, and closure plates fitting the ends of theoverhanging end portions of the hub member substantially as set forth.

5. In a blower wheel, the combination of a rim member formed by acentral ring of plate metal and a peripheral series of attached blowerblades, a hub member having overhan ing end portions formed with openended receiving slots having different lengths and oppositely inclinedrelation, the inner surfaces of said overhanging portions havingabutment faces in right-angle relation to said receiving slots, a seriesof connecting-spokes of a V form, the apex of which has engagement inorifices in the aforesaid ring and the inner ends of which spokes passthrough the aforesaid slots, and adjusting nuts engaging said'inner endsof the spokes and adapted to tension and balance the fan parts,substantially as set forth.

Signed at Chicago, Illinois, this 5th day ofAugust, 1919.

' AUGUST MATHIS.

